Countries With the Most Rainfall

The countries with the most rainfall are: Colombia (~3,240mm/year), Sao Tome and Principe (~3,200mm/year), Papua New Guinea (~3,142mm/year), Solomon Islands (~3,028mm/year), and Panama (~2,928mm/year).

Introduction

Countries With the Most Rainfall is one of the most searched geography topics on the internet. Whether you're a student, traveler, or trivia enthusiast, understanding these rankings helps paint a picture of our diverse world. In this guide, we rank the top countries and provide context for each entry.

Complete Rankings

1. Colombia — ~3,240 mm/year average

Colombia is the wettest large country on Earth, with an average annual rainfall of approximately 3,240 mm. The Choco region on Colombia's Pacific coast is one of the wettest places on the planet, receiving over 10,000 mm of rain annually. The town of Lloró in Choco has recorded averages exceeding 13,000 mm per year, rivaling the wettest spots in India.

2. Sao Tome and Principe — ~3,200 mm/year average

This small island nation in the Gulf of Guinea receives approximately 3,200 mm of rainfall annually. The southwestern slopes of Sao Tome Island, facing the moisture-laden winds from the Atlantic, receive the heaviest rains, supporting lush tropical rainforest.

3. Papua New Guinea — ~3,142 mm/year average

Papua New Guinea's rugged terrain and tropical location produce average rainfall of about 3,142 mm per year. Highland areas can receive even more, with some locations exceeding 8,000 mm annually. This precipitation supports some of the world's most biodiverse tropical forests.

4. Solomon Islands — ~3,028 mm/year average

The Solomon Islands receive approximately 3,028 mm of rainfall annually, distributed relatively evenly throughout the year due to their equatorial Pacific location. This consistent rainfall supports dense tropical vegetation across the archipelago.

5. Panama — ~2,928 mm/year average

Panama receives about 2,928 mm of rainfall per year. The Caribbean slope receives significantly more rain than the Pacific side. The rainfall is essential for the Panama Canal, which requires massive amounts of freshwater from Gatun Lake to operate its lock system.

6. Costa Rica — ~2,926 mm/year average

Costa Rica receives approximately 2,926 mm of rainfall annually. The Caribbean lowlands can receive over 5,000 mm per year, while the Central Valley receives a more moderate 1,500-2,000 mm. This abundant moisture supports Costa Rica's famous cloud forests and tropical rainforests.

7. Malaysia — ~2,875 mm/year average

Malaysia receives about 2,875 mm of rainfall per year, with the northeast monsoon (November-March) and southwest monsoon (May-September) ensuring rain throughout the year. The Cameron Highlands receive particularly heavy rainfall.

8. Indonesia — ~2,702 mm/year average

Indonesia receives approximately 2,702 mm of rainfall annually, though this varies dramatically across its vast archipelago. Bogor, near Jakarta, averages 322 days of rain per year and was once known as the "rain capital of the world."

9. Bangladesh — ~2,666 mm/year average

Bangladesh receives about 2,666 mm of rainfall per year, mostly during the monsoon season (June-September). Combined with its flat, low-lying terrain and the convergence of three major rivers (Ganges, Brahmaputra, Meghna), this produces devastating annual floods that can inundate up to 70% of the country.

10. Sierra Leone — ~2,526 mm/year average

Sierra Leone receives approximately 2,526 mm of rainfall annually, concentrated in a May-November rainy season. Freetown is one of the wettest capital cities in the world, receiving over 3,000 mm of rain per year.

11. Brunei — ~2,722 mm/year average

The tiny nation of Brunei receives about 2,722 mm of rainfall annually, supporting its extensive tropical rainforests that cover about 70% of the country.

12. India — ~1,083 mm/year national average

While India's national average is moderate, it contains the wettest inhabited places on Earth. Mawsynram in Meghalaya averages 11,871 mm annually, and nearby Cherrapunji once recorded 26,461 mm in a single year (1860-1861). These extreme rainfall totals result from moisture-laden monsoon winds hitting the Khasi Hills.

Key Context & Facts

• Global average rainfall is approximately 990 mm per year. The wettest countries receive more than three times this amount.
• The wettest place on Earth is a matter of debate. Mawsynram, India holds the current record for highest average annual rainfall, while Tutunendo, Colombia and Mount Waialeale, Hawaii are close competitors.
• Climate change is expected to intensify rainfall patterns — wetter regions are generally getting wetter while drier regions get drier, a pattern known as "wet gets wetter, dry gets drier."

Final Thoughts

The wettest countries tend to be located in tropical regions where warm ocean moisture meets geographic features like mountains that force air upward, triggering intense precipitation. Whether it's Colombia's Pacific coast or India's Khasi Hills, the interaction between ocean moisture and terrain is the primary driver of extreme rainfall. These rain-drenched nations face unique challenges including flooding, soil erosion, and infrastructure damage, but also benefit from lush ecosystems and abundant freshwater.